We report the discovery of the 20.7 ms binary pulsar J1952+2630, made using the distributed computing project Einstein@Home
in Pulsar ALFA survey observations with the Arecibo telescope. Follow-up observations with the Arecibo telescope confirm the
binary nature of the system. We obtain a circular orbital solution with an orbital period of 9.4 hr, a projected orbital radius
of 2.8 lt-s, and a mass function of f = 0.15 M ☉ by analysis of spin period measurements. No evidence of orbital eccentricity
is apparent; we set a 2σ upper limit e 1.7 × 10-3. The orbital parameters suggest a massive white dwarf companion with a minimum
mass of 0.95 M ☉, assuming a pulsar mass of 1.4 M ☉. Most likely, this pulsar belongs to the rare class of intermediate-mass
binary pulsars. Future timing observations will aim to determine the parameters of this system further, measure relativistic
effects, and elucidate the nature of the companion star.

Disclaimer/Complaints regulations

If you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let
the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible
and/or remove it from the website. Please Ask the Library, or send a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands.
You will be contacted as soon as possible.